Section 6: Navigation and Communications Capability

Roger Revelle is equipped with an extensive suite of navigation and communications instruments and devices. This equipment allows precise navigation and control of the ship and worldwide communications in voice, data and facsimile. A number of the more prominent systems and devices are listed below and described.

AMATEUR RADIO (HAM) - It is possible for licensed amateur radio operators to bring equipment aboard. Operation of ham equipment must not interfere with other ship or science operations. Individuals wishing to set up ham equipment must secure approval from the captain and chief scientist prior to departure. Bring your own antenna.

CELLULAR TELEPHONE - Roger Revelle is equipped with a cellular telephone, but she normally operates beyond the range of cellular systems.

DATA COMMUNICATIONS - (See "Radio" and "Satellite Communications" in this section, also EMAIL in Section IV.)

DEPTH RECORDING - There are two fathometers on the bridge, one digital and one recording type. A third fathometer (digital and recording) is in the electronics/computer lab. It works only to a depth of a few hundred meters.

Deep sea soundings are accomplished with the SEA BEAM 2112 or the 3.5/12 kHz echosounder system. (See ECHOSOUNDING in Section IV.)

DIRECTION FINDING EQUIPMENT - A Simrad Taiyo medium frequency RDF is installed in the chartroom for navigational purposes. A VHF direction finder is scheduled for installation in the pilot house. This RDF will operate in the 110-170 MHz range. It will be used primarily for locating autonomous vehicles at sea. Transmitters for use with this system are provided by the scientific group or arrangements for the appropriate equipment can be made with the Resident Technicians Group.

FACSIMILE EQUIPMENT - Roger Revelle carries two facsimile machines. Alden Marine Fax TR IV is located in the chart room and is dedicated to the receipt of weather maps and navigational warnings. An Omnifax G77 fax machine is located on the bridge and is interfaced with the Inmarsat system. It is configured for automatic reception of faxes from other stations. It can also be used to send faxes from the ship to any other fax machine. There are charges associated with use of the Omnifax as Inmarsat is a commercial system.

GYRO COMPASS - Roger Revelle carries two Sperry Mark 37 gyro compasses. Under normal operating conditions both units are running with one unit on-line and the other in a standby mode. In addition to compass repeaters, a number of electronic devices, including navigation systems and the shipboard computer system, have inputs from the gyro compass.

INTERNAL COMMUNICATIONS - Three installed systems facilitate internal communications around the ship - a household type dial telephone, a sound powered phone system and a mission announcement system. The directory for the dial phone system is posted next to each phone. The sound powered phone has no external power supply. A list of stations is posted on each phone. To call using the sound powered phone select the desired station. Crank the handle two or three times to ring the phone, press the button on the handset and talk. The button on the handset must be pressed both to talk and to listen. A public address system is operated from the bridge. It is used to make urgent pages and for emergencies. Instructions are posted by the various units.

NAVIGATION EQUIPMENT - Roger Revelle navigates primarily by P-code GPS. A standard GPS and Loran C are also available. The P-code GPS is linked to the computer system in the labs. P-code is also fed to the Dynamic Positioning system. A doppler log is utilized for speeds. A full set of traditional navigation equipment is maintained onboard.

RADAR - Two Sperry marine radar are carried; an S band (10 cm) and an X band (3 cm). Radar consoles are located on the bridge. Do not touch this equipment without permission of the mate on watch.

HAND-HELD RADIOS - The ship normally carries portable VHF marine radios. They are used for internal communications and small boat operations.

HF/SSB COMMUNICATIONS - Available in the band 2 to 30 MHz, in both voice and teletype. This method is for business traffic only. At sea, official outgoing messages must be approved by both the chief scientist and the captain before the radio officer transmits them. Traffic is sent through radio station WWD located at Nimitz Marine Facility, open during normal working hours (San Diego). This system depends on the vagaries of radio propagation. Sometimes it works and sometimes it does not. Check with the mate on watch for operation of this equipment and best times for chances of success.

SATELLITE COMMUNICATIONS - International Maritime Satellite, or Inmarsat is the primary satellite communications system on board. Coverage is nearly worldwide. The system, as installed on Roger Revelle can be used for voice, data and facsimile communications. It is important to note that Inmarsat is a commercial system; in most cases individual users are responsible for charges incurred through use of the system.

The dial telephone system is also linked through the Inmarsat system. Calls must be made on credit cards or collect unless other arrangements have been made with the ship's captain for future billing. Note this is a very expensive system to use - bills range from $6 to $10 a minute with a three minute minimum.

(See also EMAIL in Section IV.)

SEARCH LIGHTS - There are two installed search lights to facilitate certain operations at night.

SPEED LOG - (See DOPPLER LOG in Section IV.)

VHF COMMUNICATIONS - (See "Radio" in this section.)